chore(android): update Gradle configuration and project structure

- Enabled AndroidX support in gradle.properties for improved library compatibility.
- Created local.properties to specify the Android SDK directory.
- Updated settings.gradle to reflect the new project structure, changing the module name from ":android-app" to ":app".
- Added necessary dependencies in build.gradle for AndroidX libraries.
- Introduced new CMake and build files for various architectures to support native development.

This commit enhances the Android project setup, ensuring compatibility with modern libraries and improving build configurations.

Author: timfox